â·ÃÊͺ¶ÒÁÃÒ¤Ò The Extech DV30 is a compact solution to detecting AC Voltage without contact. DV30: Non-Contact Adjustable AC Voltage Detector Non-contact detection of AC Voltage with Sensitivity adjust Features: Non-Contact detection of AC Voltage from 12VAC to 600VAC Sensitivity adjustment increases or reduces sensor trigger threshold Audible and visible voltage indication Self test function AC DV30 Extech Multimeter Voltage Detector